hello

Acuqidml..........

follow the steps and instructions:

Clear all cookies, site data and cache

• Click the ≡ menu button. and select Options.
• Select the Privacy & Security panel and go to the Cookies and Site Data section.
• Click the Clear Data… button. The Clear Data dialog will appear. ...
• Click Clear.

Goto safe Mode:'

Click the ≡ menu button. and select new private window.

• or CTRL+SHIFT+P

tell me its help.

thank you!

You may have ad/mal-ware. Further information can be found in this article;
https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no

Run most or all of the listed malware scanners. Each works differently.
If one program misses something, another may pick it up.